ELIOT : NUDIBEANCHIATA FROM CAPE VERB ISLANDS, 149 



are sessile. The olfactory nerve is long and the distal olfactory 

 ganglion distinct. Close behind the pedal ganglia lie the buccal 

 ganglia, which touch one another as in hergh's figure. 



These specimens have most of the characters of D. areolata, Bergh, 

 and in particular agree very nearly with Vayssiere's description of the 

 specimens obtained by the "Talisman." But the reticulation on the 

 back between the tubercles, n ticed by all previous authors, is not 

 visible in the preserved specimens or mentioned by Mr. Cross! and. 

 Possibly they arethe Loriopsilla Pelseneeri of Oliveira (1 c), which is 

 said to resemble D. areolata, but to have no i eticulations and to be 

 red or yellow in colour. But it is also said to be verj- convex, and to 

 bear large tubercles of varying size on the back. It may be that 

 these specimens, the typical D. arcolata and I). Feheneeri^ are all 

 varieties of one species, which must be called D. areolata. The 

 animal's habit of exposing itself to the sun is remarkable 



In any case, it is clear that closely allied forms of Doriopnilla are 

 widely spread in the Western Atlantic and the Mediterranean. 



Plocamophekus, F. S. Leuckart. 



(See Bergh: Semper's Keisen, Heft xi, pp. 431-439, and Heft xvii, 

 pp. 949-959.) 



The genera Plocamopherus and Euplocamus form a small but distinct 

 group of the Polyceridae. Externally they are characterized by their 

 flat, ridge-like oral tentacles, and by having branched processes on the 

 oral veil, dorsal margin, and sometimes on the sides of the body. 

 Internally both the buccal parts and the genitalia are distinctive. 

 Mandibular plates are present. The rhachis of the radula is bare and 

 very wide; some (3-11) of the inner teeth are large and hamate, or 

 spoon-shaped; the remainder are flat plates. There is a large and 

 remarkable dendritic prostate which envelops the spermatotheca. 



Plocamopherus is distinguished from Euplocamus chiefly by having 

 a large frontal veil and a large crest on the tail. These developments 

 no doubt assist the animal to swim, and mean that it is specially 

 modified for an active life. Some of the species (especially P. Tilesii) 

 have a broad laminated groove in the front part of the foot, which 

 perhaps enables them to cling at this point, while the body floats freely. 

 The species described are : (1) P. ocellatus, Leuckart ; (2) P. Maderce 

 (Lowe); (3) P. Tilesii, Bergh; (4) P. Ceylonious, Kelaart (perhaps 

 ^ P. 7i(Bvatus, A.br.) ; (5) P. imperialis, An gas ; (6) P. Amboitiensts, 

 Bergh; (7) P. indicus, Bergh; (8) P. insignis, E. A. Smith; 

 (9) P. lev ivar ills, Abr, 



P. {Histiophorus) maeulatus, Pse., and P. (^Polycera) ramulosus, 

 Stimpson, are more doubtful forms. The species are fairly well 

 distinguished both by the number and character of the dorsal appendages 

 and by the number and shape of the teeth. All are recorded from the 

 Pacific only, with the exception of P. Maderce from the Atlantic and 

 P. levivarius of unknowTi habitat. 



The type species is P. ocellatus from the Eed Sea, whose external 

 features were briefly described by Leuckart. I have examined some 

 specimens of this form brought by Mr, Crossland from Suakim, and 



